實義動詞和情態動詞?

need用作情態動詞和實義動詞的區別

need v.

做實意動詞時,有兩種用法：

1.need to do sth.需要做某事

e.g I need to study hard for th exam.我需要為了考試努力學習.

He needed to drink some water.他需要喝些水.

2.need doing sth.需要被做某事（=need to be done sth.）

e.g The flowers need watering every day.花需要每天（被）澆水.

=The flowers need to be watered every day.

The classroom needs cleaning.教室需要（被）打掃.

=The classroom needs to be cleaned.

做情態動詞時,通常只用疑問式或否定式.

其否定式常用於回答Must 的疑問句

e.g -Must I finish it today?

-No,you needn't

其疑問式用於構成疑問句

e.g -Need I wear a coat?

-Sure,it's cold.